1: With potassium hydrosulphide in ethanol T=40°C; 1 h; 2: With potassium hydroxide in ethanol; water 8 h; Heating; Further stages.;

1: sodium borohydride, sodium bicarbonate / ethanol / 1 h / Ambient temperature 2: 1.) thionyl chloride, 2.) nonahydrated sodium sulphide / 1.) chloroform, 60 deg C, 3 h, 2.) ethanol, water, 120 deg C, 15 h View Scheme

1.1: 92 percent / SnCl4 / 0.17 h / 45 - 60 °C 2.1: PBr3 / 60 °C 2.2: 85 percent / aq. HBr / 1 h / 100 °C 3.1: KSH / ethanol / 1 h / 40 °C 3.2: 54 percent / KOH / ethanol; H2O / 8 h / Heating View Scheme

1.1: PBr3 / 60 °C 1.2: 85 percent / aq. HBr / 1 h / 100 °C 2.1: KSH / ethanol / 1 h / 40 °C 2.2: 54 percent / KOH / ethanol; H2O / 8 h / Heating View Scheme

sodium sulfide; thionyl chloride 1.) chloroform, 60 deg C, 3 h, 2.) ethanol, water, 120 deg C, 15 h; Yield given. Multistep reaction;